DLC Coating
A surface treatment known as DLC Coating, applied to watch components to alter appearance and/or surface properties.
Also known as: DLC, Diamond-Like Carbon, Diamond like carbon coating
Definition
DLC stands for Diamond-Like Carbon, a family of carbon-based hard coatings whose bonding structure gives them some diamond-like properties. In watches, DLC is typically applied as a thin dark surface layer to metal cases or components using vacuum-deposition techniques. It can provide high surface hardness, low friction and a deep black appearance, but performance depends on the specific DLC formulation, deposition process and substrate. DLC is therefore not simply another name for black PVD: PVD describes a deposition process family, while DLC describes the carbon-based coating material.
Why it matters
DLC can greatly improve surface wear resistance while retaining a metal case underneath. Damage that penetrates the coating can still reveal the substrate, and not all black-coated watches use DLC.